CakePHP 3.5.2 auto delete index.php in webroot why?

i use command : cake server to start the project.

It run the first time. The second time it give me this error

Warning: Unknown: failed to open stream: No such file or directory in Unknown on line 0

Fatal error: Unknown: Failed opening required ‘C:\Users\duyqu\Desktop\page\webroot/index.php’ (include_path=’.;C:\php\pear’) in Unknown on line 0

I have check several time and it appear to delete the “index.php” file in webroot folder for no reason.

Here is what is already try:
-re-download Wamp server and composer
-update to newest version 3.5.2 of cakePHP
-copy the index.php to another place and recopy them back to webroot ( can’t be done because access denied)

I am stuck and have no idea what is happening. I have been use cakePHP for 6 months and this is the first time this problem occurd

It is anti virus software auto delete index.php in webroot. Check viruschest and restore the file